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White light-emitting diode with high uniformity and wide angle intensity distribution

a white light-emitting diode and wide angle technology, which is applied in the direction of semiconductor devices for light sources, lighting and heating apparatus, planar light sources, etc., can solve the problems of difficult to precisely control the thickness of the phosphor film to form the phosphor film, non-uniform white light emitted, and difficult to uniformly control the thickness of the phosphor film to achieve uniform white light at different angles. , the effect of wide angle intensity distribution and high

Inactive Publication Date: 2015-02-05
NAT TAIWAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a white light-emitting diode with high uniformity and wide angle intensity distribution. The diode has a large illumination area, uniform intensity and color temperature, and good illuminance. The color temperature of the white light can be adjusted by changing the ratio of compositions of the white light phosphor layer or by using different wavelengths of UV LEDs. The diode has many pointolites (or point light sources) formed on its lampshade, making it possible to provide a stable white light with big illumination area, uniform intensity and color temperature, and good illuminance.

Problems solved by technology

It results in non-uniform intensity of the white light emitted from the conventional white LED 10 at different angles.
It is because the phosphor film is not thin enough to prevent the phosphor film from absorbing the white light generated by the conventional white LED 10.
Besides, it is difficult to precisely control the thickness of the phosphor film to form the phosphor film having a special or predetermined thickness, such as the thickness is thin enough to prevent the phosphor film from absorbing the white light generated by the conventional white LED 10, because most of phosphors used in the conventional white LED 10 have bigger size than micro-scale.
It results in non-uniform color temperature of the white light at different angles.
The temperature rising of the phosphor results in destruction or invalidation of the phosphor.
Therefore, the illumination area of the conventional white LED 10 is not wide enough to provide an all-dememtional illumination or a 360 degree illumination.

Method used

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  • White light-emitting diode with high uniformity and wide angle intensity distribution

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Embodiment Construction

[0021]The detailed description of the present invention will be discussed in the following embodiments, which are not intended to limit the scope of the present invention, but can be adapted for other applications. While drawings are illustrated in details, it is appreciated that the quantity of the disclosed components may be greater or less than that disclosed, except expressly restricting the amount of the components. Although specific embodiments have been illustrated and described, it will be appreciated by those skilled in the art that various modifications may be made without departing from the scope of the present invention, which is intended to be limited solely by the appended claims.

[0022]FIG. 2A is a drawing illustrating a white light-emitting diode 100 with high uniformity and wide angle intensity distribution having a single layer structure of the white light phosphor layer in accordance with one embodiment of the present invention. Referring to FIG. 2A, the white ligh...

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Abstract

The present invention relates to a white light-emitting diode with high uniformity and wide angle intensity distribution, and particularly relates to a color temperature tunable white light-emitting diode with high uniformity and wide angle intensity distribution. A nano-phosphor material is coated on one surface of a lampshade of the white light-emitting diode to form a white light phosphor layer for providing a stable white light with high uniformity, wide angle intensity distribution, and good illuminance. Furthermore, the color temperature of the white light-emitting diode can be adjusted by changing the ratio of compositions of white light phosphor layer.

Description

CROSS REFERENCE[0001]This application claims priority from Taiwan Patent Application No. 102127683, filed Aug. 1, 2013, the content of which are hereby incorporated by reference in their entirety for all purposes.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a white light-emitting diode with high uniformity and wide angle intensity distribution, and particularly relates to a color temperature tunable white light-emitting diode with high uniformity and wide angle intensity distribution.[0004]2. Description of the Prior Art[0005]Now, the white LED is fabricated by adhering a yellow phosphor (or a green phosphor or a red phosphor) on a light emitting surface of a blue LED. FIG. 1 shows a conventional white LED 10. The white LED 10 is composed of a LED (such as a blue LED) 14, a lead frame 16, a sealant 12 formed by mixing a phosphor (such as yellow phosphor, green phosphor, or red phosphor) with a glue, and a lampshade 18. The LED 14 i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F21V13/02F21K99/00F21V29/00
CPCF21V13/02B82Y99/00Y10S977/833F21V29/22F21V29/246F21K9/56F21V29/773B82Y30/00F21V29/89F21Y2105/10F21K9/232F21K9/64F21Y2115/10F21Y2107/40F21V1/17
Inventor LIN, CHING-FUHSHEN, PIN-CHUN
Owner NAT TAIWAN UNIV
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